Experimental determination of the Lorenz number in Cu[subscript 0.01]Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] and Bi[subscript 0.88]Sb[subscript 0.12]
Name
Lukas-2012-Experimental determination of the Lorenz.pdf
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Author(s)
Lukas, Kevin
Liu, W. S.
Joshi, G.
Zebarjadi, Mona
Dresselhaus, Mildred
Date Issued
May 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Lukas, K. et al. “Experimental determination of the Lorenz number in Cu[subscript 0.01]Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] and Bi[subscript 0.88]Sb[subscript 0.12].” Physical Review B 85.20 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
Nanostructuring has been shown to be an effective approach to reduce the lattice thermal conductivity and improve the thermoelectric figure of merit. Because the experimentally measured thermal conductivity includes contributions from both carriers and phonons, separating out the phonon contribution has been difficult and is mostly based on estimating the electronic contributions using the Wiedemann-Franz law. In this paper, an experimental method to directly measure electronic contributions to the thermal conductivity is presented and applied to Cu[subscript 0.01]Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] and Bi[subscript 0.88]Sb[subscript 0.12], [Cu[subscript 0.01]Bi[subscript 2]Te[subscript 2.7]Se[subscript 0.3] and Bi[subscript 0.88]Sb[subscript 0.12]][subscript 0.98]Ni[subscript 0.02], and Bi[subscript 0.88]Sb[subscript 0.12]. By measuring the thermal conductivity under magnetic field, electronic contributions to thermal conductivity can be extracted, leading to knowledge of the Lorenz number in thermoelectric materials.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.85.205410
